Diamond Cove is a local service district and designated place in the Canadian province of Newfoundland and Labrador.
Diamond Cove is in Newfoundland within Subdivision J of Division No. 3.
As a designated place in the 2016 Census of Population conducted by Statistics Canada, Diamond Cove recorded a population of 46 living in 25 of its 26 total private dwellings, a change of from its 2011 population of 51. With a land area of , it had a population density of in 2016.
Diamond Cove is a local service district (LSD) that is governed by a committee responsible for the provision of certain services to the community. The chair of the LSD committee is Ronald Hardy.